# CentoS 7 系统 扩容根分区
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## 需求场景：
{% hint style="success" %}
需要将客户物理机磁盘剩余的空闲空间分区，合并到逻辑卷，扩展根分区
{% endhint %}
## **当前环境：**
```sh
[root@master ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root 10T 9.5T 549G 95% /
devtmpfs 16G 0 16G 0% /dev
tmpfs 16G 0 16G 0% /dev/shm
tmpfs 16G 9.7M 16G 1% /run
tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/vda2 2.0G 166M 1.9G 9% /boot
tmpfs 3.2G 0 3.2G 0% /run/user/0
```
可以看到vda 磁盘有20T 还有10T空闲空间没有分配
```sh
[root@master ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 1024M 0 rom
vda 252:0 0 19.8T 0 disk
├─vda1 252:1 0 1M 0 part
├─vda2 252:2 0 2G 0 part /boot
└─vda3 252:3 0 10T 0 part
└─centos-root 253:0 0 10T 0 lvm /
```
## 操作步骤：
### 第一步：将剩余空间分区
[root@master ~]# parted /dev/vda
(parted) print
错误: 备份 GPT 表不像应该的那样出现在磁盘的末尾。这可能意味这其它操作系统相信磁盘小一些。通过将备份移动到末尾 (并删除旧备份) 来修正？
修正/Fix/忽略/Ignore/放弃/Cancel? Fix
警告: Not all of the space available to /dev/vda appears to be used, you can fix the GPT to use all of the
space (an extra 1468006400 blocks) or continue with the current setting?
修正/Fix/忽略/Ignore? Fix
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 21.7TB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name 标志
1 1049kB 211MB 210MB fat16 EFI System Partition 启动
2 211MB 1285MB 1074MB xfs
3 1285MB 537GB 536GB lvm
(parted) mkpart
分区名称？ []? 4
文件系统类型？ [ext2]? xfs
起始点？ 11.0TB
结束点？ 21.7TB
(parted) print
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 21.7TB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name 标志
1 1049kB 2097kB 1049kB bios_grub
2 2097kB 2150MB 2147MB xfs
3 2150MB 11.0TB 11.0TB lvm
4 11.0TB 21.7TB 10.7TB 4
(parted) quit
信息: You may need to update /etc/fstab.
{% hint style="info" %}
说明：parted 分区退出自动保存，不像fdisk需要保存
{% endhint %}
### 第二步：格式化分区
```sh
[root@master ~]# mkfs.xfs /dev/vda4
```
查看当前逻辑卷
```sh
[root@master ~]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 2
Act PV 2
VG Size 10 TiB
PE Size 4.00 MiB
Total PE 5180926
Alloc PE / Size 5180926 / 10 TiB
Free PE / Size 0 / 0
VG UUID jw3yqY-Ssfb-NNu3-iwDN-4CV2-d4Nq-uFL0So
```
### 第三步：逻辑化分区/dev/vda4，准备给centos逻辑卷扩容
```sh
[root@master ~]# pvcreate /dev/vda4
WARNING: xfs signature detected on /dev/vda4 at offset 0. Wipe it? [y/n]: y
Wiping xfs signature on /dev/vda4.
Physical volume "/dev/vda4" successfully created.
```
### 第四步：开始扩容
```sh
[root@master ~]# vgextend centos /dev/vda4
Volume group "centos" successfully extended
[root@master ~]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 2
Act PV 2
VG Size 19.76 TiB
PE Size 4.00 MiB
Total PE 5180926
Alloc PE / Size 5180926 / 19.76 TiB
Free PE / Size 0 / 0
VG UUID jw3yqY-Ssfb-NNu3-iwDN-4CV2-d4Nq-uFL0So
```
{% hint style="info" %}
说明：磁盘空闲空间增长到19.76T,说明扩容成功
{% endhint %}
### 第五步：扩容/dev/mapper/centos-root逻辑卷分区
```sh
[root@master ~]# lvextend -l +100%FREE /dev/mapper/centos-root
Size of logical volume centos/root changed from <10.00 TiB (2620927 extents) to 19.76 TiB (5180926 extents).
Logical volume centos/root successfully resized.
```
### 第六步：更新逻辑卷分区的大小
```sh
[root@master ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512 agcount=10, agsize=268435455 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=2683829248, imaxpct=5
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=521728, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 2683829248 to 5305268224
```
### 第七步：检查是否扩容更新成功
```sh
[root@master ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root 20T 9.5T 11T 48% /
devtmpfs 16G 0 16G 0% /dev
tmpfs 16G 0 16G 0% /dev/shm
tmpfs 16G 9.7M 16G 1% /run
tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/vda2 2.0G 166M 1.9G 9% /boot
tmpfs 3.2G 0 3.2G 0% /run/user/0
```
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